Warning: This article contains spoilers for Agatha All Along episode 1, "Seekest Thou the Road," and episode 2, "Circle Sewn with Fate/Unlock Thy Hidden Gate"

An important character related to Mephisto in Marvel Comics might have just been referenced in Marvel Television's MCU's most recent Mephisto tease.

Based on the Faust demon Mephistopheles, Mephisto is one of Marvel Comics' most notable, recognized and powerful supervillains. This prominence makes his debut in the MCU inevitable, but Mephisto has now been heavily rumored to be making his grand entrance for several years, with hints of his existence being featured in WandaVision, Loki and She-Hulk: Attorney at Law, among others. Agatha All Along may have just teased Mephisto yet again, as there were several mentions of a "black heart," which could, in fact, be referring to Marvel Comics' Blackheart.

Who Is Blackheart & How Does He Relate To Mephisto?

Blackheart Is Mephisto's Son In Marvel Comics

Blackheart is a terrifying character in Marvel Comics, created by Ann Nocenti and John Romita Jr., and first seen in 1989's Daredevil #270. Most commonly depicted as a dark and demonic adversary to Ghost Rider, Blackheart has crossed paths with a number of other heroes, including Daredevil, Spider-Man, Wolverine, Wonder Man and Sam Wilson, among others. Blackheart is remarkably powerful, with a wealth of supernatural abilities, and, interestingly, he is also depicted as Mephisto's son, as the more notable demon used magic to create Blackheart.

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Agatha All Along Episodes 1 & 2 Recap: Wanda Maximoff Is Dead & 7 Other Reveals

Agatha All Along episodes 1 and 2 continue the titular witch's journey after breaking her WandaVision spell and reveal several surprises for MCU fans.

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After centuries of murder in the town of Christ's Crown, New York, Mephisto used the accumulated evil energies in the town to forge Blackheart. Mephisto trains his son in the art of evil, but Blackheart becomes fascinated with humanity's free will, and soon turns his back on Mephisto, beginning an age-old feud between the pair. In his war against Mephisto, Blackheart carries out some heinous acts, and tries to lure various heroes to his cause. Blackheart later becomes more of a conventional villain, taking Mephisto's place as a ruler of Hell.

Agatha All Along's "Black Heart" Moment Explained

Agatha All Along Made A Big Deal Of Rio Vidal's Black Heart

Agatha Harkness, Teen and the coven on the Witches' Road in Agatha All Along episode 2

Agatha All Along first two episodes mentioned a "black heart" on several occasions. Most notably, Patti LuPone's Lilia Calderu notes in episode 2 that the fifth name she jotted down as prospective of the new coven wasn't a name at all, but a drawing of a black heart, with Agatha hilariously suggests is simply because she was using a black pen. While Agatha tries to explain that this must mean Debra Jo Rupp's Mrs. Hart, a.k.a. Sharon Davies, harking back to WandaVision's premiere, Calderu's black heart drawing actually refers to Aubrey Plaza's Rio Vidal.

Agatha Harkness' Coven Member

Actor

Agatha Harkness

Kathryn Hahn

Teen

Joe Locke

Lilia Calderu

Patti LuPone

Jennifer Kale

Sasheer Zamata

Alice Wu-Gulliver

Ali Ahn

Sharon Davies

Debra Jo Rupp

Rio Vidal

Aubrey Plaza

During the fight between Agatha Harkness and Rio Vidal at the end of Agatha All Along episode 1, Vidal mentions that she does indeed have a heart, and that it is black and beats for Agatha. Lilia Calderu was suggesting that Vidal, a Green Witch, would be necessary for the coven to access and survive the Witches' Road. Vidal's own declaration that she has a "black heart," however, has spurred a major new theory that she could, in fact, be Marvel Studios' interpretation of Mephisto's child from Marvel Comics.

Marvel Fans Think Agatha Is Setting Up Rio Vidal As Mephisto's Daughter

Rio Vidal's Backstory Hasn't Yet Been Explained

Rio Vidal in Agatha Harkness' house in Agatha All Along episode 1

The repetitive mention of a black heart and its connection to Rio Vidal in Agatha All Along's double-premiere has caused many to theorize that Aubrey Plaza's MCU character could be a depiction of Blackheart from the comics (via Mephisto's much anticipated debut. Nothing is yet known about Rio Vidal's backstory or her history with Agatha Harkness, but the episodes of Agatha All Along could finally bring Mephisto, perhaps Vidal's father, into the MCU.

New episodes of Agatha All Along release every Wednesday at 6pm PT / 9pm ET.

Agatha All Along 2024 TV Show Poster

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Agatha All Along
Release Date
2024 - 2024-00-00
Showrunner
Jac Schaeffer
Directors
Jac Schaeffer, Gandja Monteiro, Rachel Goldberg
  • Headshot Of Kathryn Hahn In The 49th Annual People's Choice Awards 2024
    Agnes O'Connor / Agatha Harkness
  • Headshot Of Joe Locke
    Joe Locke
    Teen

WHERE TO WATCH

Streaming

Agatha Harkness, after the events of "WandaVision," seeks to regain her magical powers. ing forces with unexpected allies, including the son of an old adversary, she battles new mystical threats while uncovering hidden secrets in the magical realm.

Streaming Service(s)
Disney+
Number of Episodes
9

MCU Movies